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newton_solver.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2012 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef LIBMESH_NEWTON_SOLVER_H
#define LIBMESH_NEWTON_SOLVER_H

// Local includes
#include "libmesh/libmesh_common.h"
#include "libmesh/linear_solver.h"
#include "libmesh/reference_counted_object.h"
#include "libmesh/diff_solver.h"

// C++ includes

namespace libMesh
{

class LinearSolutionMonitor {
public:
        virtual void operator() (const NumericVector<Number>& delta_u, const double &norm_delta_u,
                        const NumericVector<Number>& u, const double &norm_u) = 0;
        virtual ~LinearSolutionMonitor();
};

inline LinearSolutionMonitor::~LinearSolutionMonitor() {}


// ------------------------------------------------------------
// Solver class definition
class NewtonSolver : public DiffSolver
{
public:
  explicit
  NewtonSolver (sys_type& system);

  virtual ~NewtonSolver ();

  typedef DiffSolver Parent;

  virtual void reinit ();

  virtual unsigned int solve ();

  bool require_residual_reduction;

  bool require_finite_residual;

  bool brent_line_search;

  Real minsteplength;

  Real linear_tolerance_multiplier;

  AutoPtr<LinearSolutionMonitor> linear_solution_monitor;

protected:

  AutoPtr<LinearSolver<Number> > linear_solver;

  Real line_search(Real tol, Real last_residual, Real& current_residual,
                   NumericVector<Number> &newton_iterate,
                   const NumericVector<Number> &linear_solution);

  void print_convergence(unsigned int step_num,
                         Real current_residual,
                         Real step_norm,
                         bool linear_solve_finished);

  bool test_convergence(Real current_residual,
                        Real step_norm,
                        bool linear_solve_finished);
};


} // namespace libMesh


#endif // LIBMESH_NEWTON_SOLVER_H

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